#10: Who Exactly is Cosmo Kramer?
Kramer must be the biggest mystery of the show. The ever-present next-door neighbor is everyone’s worst nightmare. But this is one of the things that makes Seinfeld so relatable. Unpredictable, unreliable, and often very supportive, Kramer lives by his own set of rules. A set of rules that no one seems to really understand or know how to look up.

Most easily described as eccentric, Kramer’s first name isn’t even mentioned on the show until season six. In a series of new moments on the show, we not only meet Kramer’s mom, Babs but learn his real name. In one episode in season six, the viewers – as well as Jerry and Kramer’s good friend Newman – finally learn his first name, Cosmo. And they have a good laugh about it.